Bump golang from 1.21-alpine to 1.23-alpine

Bumps golang from 1.21-alpine to 1.23-alpine.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Dockerfile

@@ -1,6 +1,6 @@
 FROM hairyhenderson/upx:3.96 AS upx
 
-FROM golang:1.21-alpine AS build
+FROM golang:1.23-alpine AS build
 
 RUN apk add --no-cache \
     make \